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        /* 
数组的遍历：
         1.直接遍历
         2.for循环遍历
         3。通过数组的长度获取
        */
        //1. 
        let arr = ['大牛', 12, 13, 14, true];
        console.log(arr[0]);
        console.log(arr[2]);
        //2. 
        for (let i = 0; i < 5; i++) {
            console.log(arr[i]);
        }
        //3.
        for (let i = 0; i < arr.length; i++) {
            console.log(arr[i]);
        }
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